<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=<style>
        .container {
          background-color: cadetblue;
        }
    
        .container>div {
          width: 200px;
          height: 200px;
          /* background-color: orange; */
          margin: 10px;
          border: 1px solid #333;
        }
    
        .container::after {
          /* 表现形式为块级元素 */
          display: block;
          /* 内容为空 */
          content: '';
          /* 清除左右两侧浮动 */
          clear: both;
        }
    
        #one {
          float: left;
          background-color: orange;
          /* margin-left: 200px; */
        }
    
        #two {
          float: left;
          background-color: red;
          /* margin-left: 100px; */
        }
    
        #three {
          float: left;
          background-color: green;
          /* margin-left: 200px; */
        }
      </style>
    </head>
    
    <body>
      <div class="container">
        <div id="one"></div>
        <div id="two"></div>
        <div id="three"></div>
      </div>, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    
</body>
</html>